Income Taxes (Components of Loss Before Income Taxes) (Details) (USD $) In Millions	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Income Taxes
Domestic	$ (189)	$ (501)	$ (670)
Foreign	(90)	(205)	(185)
Loss before provision for (benefit from) income taxes	$ (279)	$ (706)	$ (855)

The portion of earnings (loss) from continuing operations before income taxes that is attributable to domestic operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Subparagraph 1(i)
-Article 4

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- Definition

The portion of earnings (loss) from continuing operations before income taxes that is attributable to foreign operations, which is defined as income (loss) generated from operations located outside the entity's country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 08
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- Definition

Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.

+ References

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-Number 210
-Section 08
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-Subparagraph 1(i)
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